Tungsten wire is made of pure tungsten metal or doped tungsten wire by powder metallurgy and plastic processing methods (such as wire drawing mould, electrolytic polishing and other processes). Tungsten wire has high melting point, high density, high strength, high anodic rate, low vapour pressure, slow evaporation, high temperature, abrasion resistance, impact resistance, acid and alkali resistance and other characteristics. Tungsten filament is divided into ordinary tungsten filament and non-sag tungsten filament. Ordinary tungsten filament is mainly used in incandescent lamps, tungsten halogen lamps and other electric light sources in a variety of luminescent tungsten filaments, which is the purpose of tungsten filament initial invention and production.